Sound-box coupling for talking-machines



v 1.0. DRAKE. SOUND BOX COUPLING FOR TALKING MACHINES.

APPLICATION FILED APR-17,1917.

Patented Mar. 1, 1921.

2 SHEETS-SHEET I- alitozmev;

- J. C. DRAKE.

SOUND BOX COUPLING FOR TALKING MACHINES.

APPLICATION FILED APR. 17, 1917.

1 69,793, Patented Mar. 1, 1921.

2 SHEETS-SHEET 2' 311 mm 1 0'0 ML UNITED? STATES PATENT oFF 1c1=..*-f

' erence being Be it known that I, JAMES citizen of the United States, residing Rochester, in the county of :Olmsted and State of Minnesota, have invented certain new and-useful Improvements .in Sound- JAMES c. DRAKE, 0F RooHEsrER, iviiivnEso'ri-i, assrelvo'R ro sEARs, RoEBuoK Aivi) COMPANY, or NEW YORK, 1v. Y.,

A ooRroRArro v on EW YoRK.

.souND- ox COUPLING EoR TALKING-VIVIACIQIIINESI.

T0 allwhom'it may concern: I j

C. DRAKE,a

Box Couplings for Talking-Machines, of which the following is a' specification, refhad therein to the accompanyin drawing.

y invention relates to sound recording and. reproducing machines and especially sound box mountings therefor.

An object ofrmy invention is to provide a of a machine of the above type, in different positions or adjustments for use with either type of record.

vide means for connecting the interior of the diaphragm chamber of the sound :box

with the interior of the tone arm-whereby vibrations extraneous to and of the sound box body shall notbe communicated to the tone arm and a firm and positive connection between separable tubular sections shall beafi'orded without the necessity for'machining the parts to an accurate lit with consequent increase incost ofproduction.

Other'objects of my invention reside in the novel construction, combinationand arrangement ofparts hereinafter described and. particularly 1 pointed out in*the appended claim.

' "I attain my'objects the following manner: First, I provide the tone arm witha short terminal 'fitting which may be pivoted to the armtohave play upward and downward with respect thereto. This fitting I V is adapted toreceive either one of two short adapters or attachmentsgto whichthesound 7 'box may be attajched, one of theladapters holding the'box in an inclined position to play from a vertically cut record, while the other adapter holds the box upright" with the plane of its diaphragm parallel to the axis of the tone arm and perpendicular to the surface of the record, for playing lat- "e rally" cut records. Second,'I provide the neck of the sound box witharubber gasket I arranged tobe interposed between said neck or flange-0f: the sound box and the metal Specification of Letters Patent.

.in simple and effective arrangement for'mounting the "same sound box upon the tone arm ofthe tube as before Application filed .Apri1l17, 1917. *Serial No. 162,747.

part of thefitting or adapter t is attached." 1

My invention illustrated in 'panying. drawings in which-'- Figure "1. is 'a .t0 1an view of a .tone

arm with-one forin'ofsound box connectremoved; 1 o

Fig. 2 is'a side elevation of-the same:

rat'e ted uahf1,1921. i

the accoming elbow .attached'and wit'h the sound box Fig. 3 is a fragmentary side view of the v jointed end of the tone arm.-- v

' Fig. 4 is. a top plan view 'ofthe link adapter. for

records. igj5 is a side m Fig. 6is a side view of theadapter for use with perpendicularly undulating records. Fig. 7jis a side view of the sound box mounting assembled with the adapter. of

. Fig. 6.

I 'Ref'erring to the detailszofathe drawings, 1"indicates the body ofth'e tone arm supported by the elbow 2-which is pivotedat 3 to permit the tone arm to swing hori 'iviewer-riglf I a I elbow use with laterally: undulat- 'zontally. The 1 hollow elbow 2 communicates with a suitablehorn or amplifier not shown, through the flanged collar. 4. .The tone arm is provided at its freeend with a short pivotedtubular section r forming the terminal-of the' tone arm proper. The tone arm terminal 5 is'provided' withea"lat- .erally projecting. stud 6 and is split or slotted ati? passingthrough the center of the stud 6. By the provision of the slot 7a certain amount of expansion of theend of'the section 5 is afforded, andto-increas'e the resiliency of the tube at this locality,

tube 5, although it may of course be cast or otherwise formed upon the tube. Also if desirable otherjslots like 7 may be formed in the tube, although in practice it is found that by "reducing the-thickness of the; wall stated, a; single slot is suflicienu .c-.- g

For the purpose of connecting .the sound box to this tone arm-terminal 5,11 :provide a pair of interchangeable elbow link adapters 10 and""1-1,";shovvn detachedin Figs...4,,-5

.I reduce the thicknessof the wall of'the tube as indicated at. 8 from the freeend- .andQG, which elbows 'I-are alike in all' re spects except that they Vary somewhat in length-and angular adjustment. This variation, as will later appear, is for the purpose of connecting the same" sound box, or sound boxes of the same-type, with the tone arm in different angular relations thereto according to the type of'rec ordto be played. For example, the adapter is for use with records 1 of the laterally-undulating-groove type, while the adapter 11: is foruse with records of the perpendieularly-undulating- .groovetype;

In F'gs. land 2, I have shown the adapter 10 in operative connection'with. the tone arm terminal 5, Fig. 1, without the'sound' box, and Fig. 2 withthe sound box12. 1 The r adapter 10 consists of a tube bent in the form'rof a rectangular elbow having one 'end reduced as at 13 to fit within the tone armterminal and forming a shoulder 14. Mounted onthe reduced portion 13 and pro- I j ecting outwardly and radially therefrom is "athreaded' shank 15 whichis held fixed in the elbow, preferablyby a soldered head 16. This threaded shank is of such diameter as 7 to enable it to pass into the slot when the reduced end 13 of the elbow is passed into the tone arm terminal 5 and isso spaced from the shoulder 14' that upon the engagement of'the shoulder with the end of'the tone arm terminal, the said shank will be positioned in theslot eoaxially with the stud 6. A bindingorlock nut l7' is carried by the shank in thread'ed engagement therewith andis provided with a socket 18 on its end surface for engagement with the stud 6.

Theengaging surfaces of the parts 5 and '13 are so proportioned in relation to each other that their engagementcauses a slight distortion or'expansion ofthe slotted end of the member'5'so thatthe resiliency of the reduced portion 8 together with the binding effect of the lock nut 17 will afford a tight non-vibrating connectionj the engagement of the stud 6 with the socket 18 forming a positive lock. The outer end 19 of the adapter 10jis reduced to form a shoulder 20, the reduced portion having a longitudinal slot 21 therein which acts as a guide for BOT positioning the sound box. The arrangement of the sound box terminal for engagement with'this outer end 19 of the elbow is shown in Fig. 7' and consistsof the tubular I 1 extension 22'fitted'with a bushing 23 0f rubher or other suitable elastic sound insulating material. The inside diameter ofthe elastic compression of the bushing. A guiding stud or shank 24: is carried by the tubular extension 22 and extends inwardly and radithe arm, a sound box, and a pair of interally thereof throughth'e bushing a suflicient distance to'engage with the slot 21- in the end-of the'elbowi" This guide shank 24: is so positioned that whenthe sound box is coupled ontovthe elbow, the axis of the stylus point 25 will take the angular'position indicated in Fig.2. Thus, as shownin Fig. i 2 when the sound box "is'connected with the tone arm' by theadapter 10, the parts are in the correctr'elative adjustment for playing records of the laterally-undulatinggroove type. 1

,The adapterv 11 has its coupling ends 26 and 27 formed identically like the corresponding ends 13 and 19 0f theadapter '10, the end 26 being reducedaand providedwith a threaded shank 28 and s ocketed loek nut 29 arrangedto cooperate with the tone arm provided witha slot .30 forc'ooperation with the couplingmeans;carriedwbythe. sound box 12, so thatithe ends27: and28. mayco operate with the tone. arm terminal and the 1 terminal 5,. and the 'endz27xreduced and sound box terminal interchangeably. with l the corresponding portions ofthezadapter 10. The body of the adapter ll-is made shorter than that of the'adapter 10 'and is' given the form of'a reflex or double; curve so that .when it'is used to connect the sound box 12to the tone arm" terminal; 5 asindicated in Fig *7, the sound box will be positioned transversely with the axis o'fzthe tone arm and at theproper incline-or anglefor playing records of the perpendicularly-un dulating-groove type; the distance 5 between the coupling ends 27 and-28 being: such that the stylus point 25 will be at theZsaine-distance from .the axison which the tone arm is pivoted as when the elbow10 isiused. T

1 .While I have shown thetone arm terminal 5v pivoted'to the tone arm body, it is to be understood that in certain types of tone arms From-the above 1t will be seen that I have relation to the tone provided a simple ,and effective means for connecting the sound box with the tone arm in different positions .forcooperation with different types of records, respectively. By the use of the interchangeable adapters herejustments is fixed and; determined by; the

[-inshownand described, each ofthe two adform given the particular adapter tobe i used with that adjustment so thatthere is no possible error in making the adjustment so long as the proper link is used.

Having thus described my invention'what" I claim and desire to secure by Letters Pat- A tone arm having a stub tube constitutjoint connecting one end of: said tube with changeable elbow members each provided at one'end with a fitting to make.rigid' and mg a continuation of saidarm, a transverse 1,369,793 I r e i 8' I non-rotatable connection with the sound box, curve, whereby the sound box may be held and at the other end, with means to autoon the stub. tube and move therewith and matically set and to hold rigidly the respecthere0n, in either of twopositions, with its 10' tive elbow in connection with the free end diaphragm in planes atright angles to each of the movable stub tube of the tone arm at other. 4 H right angles with the other elbow, one elbow In testimony whereof I affix m signature. having a double curve,'the other. a single I 7 JAMES C; RAKE. 

